Micro Penta Prism (Five-Sided Prism)
Specifications
Prism Type: Penta Prism (Five-Sided Reflecting Prism, 90° Fixed Deviation)
Leg / Face Size (A = B): 1.0 mm minimum (1.0 / 2.0 / 3.0 / 5.0 mm standard; custom ≥0.5 mm on request)
Overall Height: Proportional to leg size (per drawing)
Material: N-BK7 (nd = 1.5168 @ 587.6 nm); H-K9L / UV Fused Silica / SF11 available
Dimensional Tolerance: ±0.02 mm (micro) / ±0.10 mm (standard)
90° Deviation Tolerance: ±2 arcmin standard (±30 arcsec / ±1 arcmin available)
Surface Quality: 40-20 or 20-10 Scratch-Dig (per MIL-PRF-13830B)
Surface Flatness: λ/4 @ 632.8 nm (λ/10 optional on clear aperture)
Clear Aperture: > 80–85% of entrance face
Coating – Reflecting Faces: Aluminized + black protective paint (Dielectric HR optional)
Coating – Entrance & Exit Faces: Uncoated / MgF₂ / BBAR (400–700 nm or 650–1050 nm)
Wavelength Range: 400–700 nm (Visible, BK7); 185–2100 nm (UVFS version)
Image Orientation: Right-handed (erect & unreversed — no inversion by double reflection)
Bevel / Chamfer: Protective bevel 0.05–0.15 mm × 45°
